Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig. 5.
Fig. 6.
Fig. 7.
Fig. 8.
Fig. 9.
Chemical composition of AISI 304 stainless steel
| Element | C | Cr | Ni | Mn | P | Si | S | Fe |
|---|---|---|---|---|---|---|---|---|
| Wt. % | 0.07 | 18.25 | 8.2 | 1.8 | 0.044 | 0.77 | 0.032 | balance |
The values of the Imean and Vmean were calculated from the data recorded in Figures 3 and 4 for AISI 304 SS at different percentages of frankincense addition to ferric chloride solution_ The noise resistance (Rn) was calculated from σV and σI according to Equation (1)
| % of frankincense addition | Imean (A.cm−2) | Vmean (V) | σI (A.cm−2) | σV (V) | Rn (Ω.cm2) |
|---|---|---|---|---|---|
| 0 | 6.05×10−02 | –3.82×10−03 | 9.70×10−03 | 5.82×10−05 | 6.00×10−03 |
| 2.5 | 4.75×10−02 | −4.06×10−03 | 6.79×10−03 | 5.69×10−05 | 8.37×10−03 |
| 5 | 3.42×10−02 | −4.19×10−03 | 2.64×10−03 | 4.72×10−05 | 1.79×10−02 |
| 7.5 | 1.58×10−02 | −4.10×10−03 | 3.99×10−03 | 3.12×10−05 | 7.82×10−03 |
| 10 | 7.90×10−04 | 1.34×10−02 | 8.65×10−04 | 1.80×10−03 | 2.08 |
Polarization parameters of 304 SS in 0_5 M FeCl3 with various percentages of frankincense additions
| % of frankincense addition | Icorr. (A.cm−2) | Ecorr. (V) | EI (%) |
|---|---|---|---|
| 0 | 7.17×10−04 | −0.370 | 0 |
| 2.5 | 6.12×10−04 | −0.324 | 14.62 |
| 5 | 5.20×10−04 | −0.321 | 15.03 |
| 7.5 | 4.30×10−04 | −0.280 | 17.31 |
| 10 | 4.01×10−04 | −0.268 | 6.70 |